The results of research conducted under these programs are published as the NCHRP, TCRP, or ACRP Legal Research Digest series. Each document is intended to provide highway, transit, or airport attorneys with authoritative, well-researched, specific information that is limited in scope. The studies focus on legal issues and problems having national significance to their respective industry. The Legal Research Digest provides highway-, transit-, and airport-related legal research on a wide variety of legal topics.